CN111244994A - Active-reactive cooperative control method for energy storage power station - Google Patents
Active-reactive cooperative control method for energy storage power station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses an active-reactive cooperative control method of an energy storage power station, which is characterized in that the active-reactive power control capability of the state of the energy storage power station is combined by collecting the state information parameters of a power grid, starting from a nine-region diagram division principle, the state of the power grid is periodically monitored and identified, the self state judgment of the energy storage power station is matched, the active-reactive power control of the energy storage power station is switched in a strategy manner, a battery energy storage system is utilized to be charged and discharged in a grid-connected mode through an energy storage inverter, the power grid energy is automatically output or absorbed, the active-reactive power regulation function of accessing the energy storage into a transformer substation is realized, and the purposes of improving the quality; the invention utilizes the active-reactive power output capacity of the energy storage system to carry out regulation control, can flexibly realize the change of the regulation limit values of the active power and the reactive power, fully exerts the capacity advantage of the transformer substation, ensures the active and reactive regulation requirements of the power grid and improves the utilization rate of equipment.
Description
Technical Field
The invention belongs to the technical field of intelligent power distribution, and particularly relates to an active-reactive cooperative control method for an energy storage power station.
Background
With the development of society, electric energy becomes essential secondary energy in production and life of people, and brings endless convenience to production and life of people. With the development of technology, the status of electric energy use is gradually improved, and the realization of electric energy replacement is an energy development target of the modern society. In the terminal energy consumption link, the energy consumption modes of scattered coal and fuel oil are replaced by electric energy, such as electric heating, geothermal energy heat pump, industrial electric boiler (kiln), electric automobile, electric energy storage peak regulation and the like.
The premise of the use of the electric energy is the reliability and safety of the quality of the electric energy. With the large-scale rapid construction and operation of renewable energy power plants such as wind power generation and photovoltaic power generation in China, the inherent uncertainty, intermittency and volatility characteristics of the power generation have great influence on the operation of a power grid. By utilizing the active and reactive fast throughput capability of energy storage, the active-reactive balance of the power grid is participated in, and an effective scheme for solving the problem of safe and stable operation of the power grid is provided.
In order to guarantee safe and economic operation of a power grid under the condition of large-scale new energy power generation access in China, and improve large-scale new energy power generation grid-connected consumption and large-scale resource optimization configuration level, the improvement of power grid intellectualization, the improvement of power transmission margin control capacity, and the promotion of large-scale new energy consumption, energy conservation and emission reduction are urgently needed.
In fact, as an important component of the ubiquitous power internet of things, an energy storage power station is fused with a traditional transformer substation, and a data station is endowed with the function, so that the ubiquitous power internet of things is called as a three-station-in-one. The energy storage power station has quick charge and discharge speed, and the charge and discharge process is accurate in control and convenient and flexible in application no matter active power or reactive power. The energy storage power station is utilized to realize the active-reactive coordination control of the power grid, the power grid equipment resources can be fully utilized, and the operation safety of the power grid is improved.
In the traditional power grid active-reactive power regulating equipment, the adjustable reactive power regulation and active power regulation ranges are fixed, secondary artificial regulation and division are performed under the capacity of a transformer substation, and the capacity of the transformer substation cannot be fully utilized to a certain extent.
Disclosure of Invention
Aiming at the technical problems of poor safety stability and low intelligent level of a power grid, the invention aims to provide an active-reactive power cooperative control method of an energy storage power station, which is used for dynamically adjusting the output of active power and reactive power according to the load power P of a battery energy storage system accessed to a transformer substation and the voltage U of an accessed bus, combines the drawing of a nine-region diagram and the state of the battery energy storage system to fully exert the utilization rate of the battery energy storage system (active-reactive equipment), utilizes the good charging/discharging capacity of the battery energy storage system, improves the power supply quality of the power grid and maintains the safe and stable operation of the power grid.
In order to achieve the purpose, the invention provides the following technical scheme: an active-reactive cooperative control method for an energy storage power station comprises the following steps:
s1, acquiring load work of battery energy storage system accessed to transformer substation from power gridRate P, access bus voltage U, and state of charge SOC of battery energy storage systembatteryThe data sampling period is T;
s2, establishing a nine-area diagram of the voltage U and the load power P according to the voltage U and the load power P obtained in the step S1, and judging the state and the area of the energy storage power station;
s3, according to the power grid state judged in the step S2, adjusting and switching an active-reactive power output coordination control strategy of the energy storage system to realize an energy storage output active power output value PbatteryAnd reactive power output value QbatteryDetermination of (1);
and S4, according to the control strategy selected in the step S3, issuing an instruction to the battery energy storage system to complete the active-reactive power output process.
In addition to the above technical solution, in step S2, the state and area of the energy storage power station are determined;
1) when U is more than or equal to 0 and less than UL0，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 1: the output power and the voltage of the energy storage system in the region are low;
2) when U is turnedL0≤U＜UH0，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 2: the voltage of the energy storage system in the area is in an optimal state, and the output power of the power station is low;
3) when U is turnedH0≤U，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 3: the voltage of the energy storage system in the area is in a higher state, and the output power of the power station is lower;
4) when U is turnedH0≤U，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 4: the voltage of the energy storage system in the area is in a high state, and the output power of the power station is in an optimal state;
5) when U is turnedH0≤U，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in a region 5: the voltage of the energy storage system in the area is in a high state, and the output power of the power station is also in a high state, namely, the power station is close to a full power state;
6) when U is turnedL0≤U＜UH0，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in an area 6: the voltage of the energy storage system in the region is in a proper state, and the output power of the power station is in a higher state, namely, the power station is close to a full power state;
7) when U is more than or equal to 0 and less than UL0，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in a region 7: the voltage of the energy storage system in the region is in a low state, and the output power of the power station is also in a high state, namely, the power station is close to a full power state;
8) when U is more than or equal to 0 and less than UL0，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 8: the voltage of the energy storage system in the region is in a low state, and the output power of the power station is in a proper state;
9) when U is turnedL0≤U＜UH0，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 9: the voltage of the energy storage system in this area is in a more favorable state, and the output power of the plant is also in a more favorable state, in which the regulation margin and the regulation state of the energy storage plant are also optimal.
As a supplement to the above technical solution, in step S3, the active power output value P of the stored energy output isbatteryAnd reactive power output value QbatteryThe determination specifically comprises the following steps:
according to the self state of charge SOC of the battery energy storage systembatteryAnd judging the state of energy storage:
setting the upper and lower output limits of active power and reactive power in the control strategy, wherein the upper limit of the active power is PmaxThe lower limit of active power is Pmin(ii) a Upper limit of reactive power of QmaxThe lower limit of the reactive power is QminAnd self-recovery is carried out on the self-state of the energy storage system, and the PCS inverter is utilized to control the charge and discharge of the energy storage system so as to realize the best performance maintenance of the equipment state of the energy storage system:
1)0≤SOCbattery＜SOCminthe energy storage system is in a state 1, and the energy storage system is insufficient in electricity quantity in the state and needs to be charged to supplement electric energy;
2)SOCmin≤SOCbattery＜SOCmaxthe energy storage system is in a state 2, and the state of the charge capacity of the energy storage system is good and the energy storage system can be charged and discharged;
3)SOCmax≤SOCbatterythe energy storage system is in a state 3, and the energy storage system is rich in electric quantity and suitable for discharging;
the charging and discharging power limit value of the energy storage system comprises the following situations and should meet the following conditions:
Pbattery∈[Pmin，Pmax]
Qbattery∈[Qmin，Qmax]
Sbattery∈[Smin，Smax]
Sbattery 2＝Pbattery 2+Qbattery 2and the active and reactive power output of the stored energy always meets the following requirements:
wherein the upper limit of active power is PmaxThe lower limit of active power is Pmin(ii) a Upper limit of reactive power of QmaxThe lower limit of the reactive power is Qmin；SbatteryApparent Power (KVA) with an upper limit of SmaxApparent power lower limit of Smin；
Case 1: maximum limit gear: pbattery＝Smax，Qbattery＝0；
Case 2: second-maximum gear limiting: pbattery＝A*Pmax，Qbattery＝B*Qmax；
Case 3: intermediate gear: pbattery＝Pmax，Qbattery＝Qmax；
Case 4: and (4) secondary small gear limiting: pbattery＝B*Pmax，Qbattery＝A*Qmax；
Case 5: minimum gear limiting: pbattery＝0，Qbattery＝Smax；
Wherein: a. the>1，B<1，Smax 2＝A2*Pmax 2+B2*Qmax 2(ii) a A. And B is any coefficient determined according to the running state of the power grid.
As a supplement to the above technical solution, in step S4, the active-reactive power output process switches the control strategy of energy storage and generates active-reactive power commands of energy storage in each control strategy according to the judgment result of the state of the energy storage system and the upper and lower limits of the energy storage output:
1) when the grid state is in zone 1:
① if the energy storage system is in state 1, the energy storage system does not act;
②, if the energy storage system is in states 2 and 3, the energy storage system can be charged and discharged with active power preferentially, the control strategy adapts to scenario 3 under the working condition, and the active regulation range of the energy storage output is set as a middle gear;
2) when the grid state is in zone 2:
① if the energy storage system is in state 1, the energy storage system can be charged with reactive power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 2 under the working condition, and the active regulation range of the energy storage output is set to be a second-largest gear;
3) when the grid state is in zone 3:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 1 under the working condition, and the active regulation range of the energy storage output is set as the maximum limit gear;
4) when the grid state is in zone 4:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy under the working condition is adaptive to the situation 4, and the active regulation range of the energy storage output is set to be a second-smallest gear;
5) when the grid state is in zone 5:
① if the energy storage system is in state 1 or 2, the energy storage system can be charged with active power preferentially to restore the state of charge to close to state 3;
② if the energy storage system is in state 3, the energy storage system does not need to be active;
6) when the grid state is in zone 6:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy under the working condition is adaptive to the situation 4, and the active regulation range of the energy storage output is set to be a second-smallest gear;
7) when the grid state is in region 7:
① if the energy storage system is in state 1, the energy storage system can be charged with reactive power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, charging and discharging of reactive power can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 5 under the working condition, and the active power adjusting range of the energy storage output is set to be the minimum limit gear;
8) when the grid state is in zone 8:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially, so that the state of charge is restored to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 2 under the working condition, and the active regulation range of the energy storage output is set to be a second-largest gear;
9) when the grid state is in zone 9:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
② if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 3 under the working condition, and the active regulation range of the energy storage output is set to be a middle gear.
The invention also provides a battery energy storage system, which adopts the active-reactive cooperative control method of the energy storage power station, utilizes the battery energy storage system to perform grid-connected charging and discharging through an energy storage PCS (Power converter System) inverter, and automatically outputs power or absorbs the energy of a power grid, thereby realizing the active-reactive power output regulation function of accessing the energy storage into the transformer substation, and achieving the purposes of improving the quality of electric energy and improving the stability of the power grid.
Further, the battery energy storage system is controlled by the PCS inverter to be merged into a power grid through a circuit breaker, a power instruction and a charging/discharging instruction of the battery energy storage system are controlled, and the charging/discharging of the battery energy storage system is controlled to complete the adjusting process.
Compared with the prior art, the invention has the following advantages:
the invention discloses an active-reactive power cooperative control method of an energy storage power station, which is characterized in that the active-reactive power cooperative control method of the energy storage power station is implemented by collecting power grid state information parameters and combining the active and reactive power control capabilities of the energy storage power station state, starting from a nine-region diagram division principle, periodically monitoring and identifying the power grid state, matching with the self state judgment of the energy storage power station, and carrying out strategy switching on the active-reactive power control of the energy storage power station, and utilizing a battery energy storage system to carry out grid-connected charging and discharging through an energy storage inverter, and autonomously outputting or absorbing power grid energy, so that the active-reactive power regulation function of an energy storage access transformer substation is realized.
According to the battery energy storage system, the active-reactive power output capacity of the energy storage system is utilized to carry out regulation control, the change of the regulation limit value of the active power and the reactive power can be flexibly realized, the capacity advantage of a transformer substation is fully exerted on the basis of ensuring the regulation capacity of the active power and the reactive power of a power grid, the active and reactive regulation requirements of the power grid are ensured, and the utilization rate of equipment is fully exerted and improved.
Drawings
Fig. 1 is a nine-zone diagram of state division based on substation collected data provided by the invention.
Fig. 2 is a state division diagram of the energy storage system provided by the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and drawings.
Example 1
The main ideas of the invention are as follows: the method comprises the steps of dividing and judging the state of the power grid by using the real-time state of the power grid (including the output power of the energy storage power station and the voltage value of the power grid) and combining a nine-area diagram, and performing coordinated control on the active-reactive power output of the energy storage power station based on the dividing and judging result. The method and the device realize that the active-reactive charging and discharging capacity of the energy storage power station is fully utilized under the existing equipment condition, and the problem of electric energy quality caused by the shortage of active power and reactive power of a power grid is solved. On the basis of realizing the improvement and the adjustment of the active-reactive power balance of the power grid by utilizing the stored energy, the utilization rate of equipment is improved, and the problem of the safety stability of the power grid caused by the deficiency of the traditional active-reactive power reserve or the waste caused by the idle of the equipment is avoided.
The embodiment provides an active-reactive cooperative control method for an energy storage power station, and a nine-zone diagram of state division based on substation collected data corresponding to the control method is shown in fig. 1.
An active-reactive cooperative control method for an energy storage power station is characterized by comprising the following steps:
step 1: acquiring load power P of an energy storage access transformer substation or voltage U of an accessed 10KV bus and energy storage charge state SOC (state of charge)batteryThe acquisition data period is T (the following acquired grid data are time-series data, and the update period is T, i.e., U ═ U (i), P ═ P (i), and SOCbattery＝SOCbattery(i)，i＝iT)；
Step 2: according to the data of the voltage U, the power P and the like acquired in the step 1, a nine-area diagram of the voltage U and the power P is established, and the state and the area of the energy storage power station are judged;
and step 3: according to the power grid state judged in the step 2, an active-reactive power output coordination control strategy of the energy storage power stationThe adjustment and the switching are carried out to realize the output value P of the active power of the energy storage outputbatteryAnd reactive power output value QbatteryDetermination of (1);
and 4, step 4: and (4) issuing an instruction to the energy storage power station according to the control strategy selected in the step (3) to complete the active-reactive power output process.
In step S2, the state and area of the energy storage power station are determined;
1) when U is more than or equal to 0 and less than UL0，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 1: the output power and the voltage of the energy storage system in the region are low;
2) when U is turnedL0≤U＜UH0，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 2: the voltage of the energy storage system in the area is in an optimal state, and the output power of the power station is low;
3) when U is turnedH0≤U，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 3: the voltage of the energy storage system in the area is in a higher state, and the output power of the power station is lower;
4) when U is turnedH0≤U，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 4: the voltage of the energy storage system in the area is in a high state, and the output power of the power station is in an optimal state;
5) when U is turnedH0≤U，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in a region 5: the voltage of the energy storage system in the area is in a high state, and the output power of the power station is also in a high state, namely, the power station is close to a full power state;
6) when U is turnedL0≤U＜UH0，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in an area 6: the voltage of the energy storage system in the region is in a proper state, and the output power of the power station is in a higher state, namely, the power station is close to a full power state;
7) when U is more than or equal to 0 and less than UL0，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in a region 7: the voltage of the energy storage system in the region is in a low state, and the output power of the power station is also in a high state, namely, the power station is close to a full power state;
8) when U is more than or equal to 0 and less than UL0，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 8: the voltage of the energy storage system in the region is in a low state, and the output power of the power station is in a proper state;
9) when U is turnedL0≤U＜UH0，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 9: the voltage of the energy storage system in this area is in a more favorable state, and the output power of the plant is also in a more favorable state, in which the regulation margin and the regulation state of the energy storage plant are also optimal.
In step S3, the active power output value P of the stored energy outputbatteryAnd reactive power output value QbatteryThe determination specifically comprises the following steps:
according to the self state of charge SOC of the battery energy storage systembatteryAnd judging the state of energy storage:
setting the upper and lower output limits of active power and reactive power in the control strategy, wherein the upper limit of the active power is PmaxThe lower limit of active power is Pmin(ii) a Upper limit of reactive power of QmaxThe lower limit of the reactive power is QminAnd self-recovery is carried out on the self-state of the energy storage system, and the PCS inverter is utilized to control the charge and discharge of the energy storage system so as to realize the best performance maintenance of the equipment state of the energy storage system:
1)0≤SOCbattery＜SOCminthe energy storage system is in a state 1, and the energy storage system is insufficient in electricity quantity in the state and needs to be charged to supplement electric energy;
2)SOCmin≤SOCbattery＜SOCmaxthe energy storage system is in a state 2, and the state of the charge capacity of the energy storage system is good and the energy storage system can be charged and discharged;
3)SOCmax≤SOCbatterythe energy storage system is in a state 3, in which the energy storage system is rich in electricity and is suitable for performing a discharging action, as shown in fig. 2 specifically;
the charging and discharging power limit value of the energy storage system comprises the following situations and should meet the following conditions:
Pbattery∈[Pmin，Pmax]
Qbattery∈[Qmin，Qmax]
Sbattery∈[Smin，Smax]
Sbattery 2＝Pbattery 2+Qbattery 2and the active and reactive power output of the stored energy always meets the following requirements:
wherein the upper limit of active power is PmaxThe lower limit of active power is Pmin(ii) a Upper limit of reactive power of QmaxThe lower limit of the reactive power is Qmin；SbatteryApparent Power (KVA) with an upper limit of SmaxApparent power lower limit of Smin；
Case 1: maximum limit gear: pbattery＝Smax，Qbattery＝0；
Case 2: second-maximum gear limiting: pbattery＝A*Pmax，Qbattery＝B*Qmax；
Case 3: intermediate gear: pbattery＝Pmax，Qbattery＝Qmax；
Case 4: and (4) secondary small gear limiting: pbattery＝B*Pmax，Qbattery＝A*Qmax；
Case 5: minimum gear limiting: pbattery＝0，Qbattery＝Smax；
Wherein: a. the>1，B<1，Smax 2＝A2*Pmax 2+B2*Qmax 2(ii) a A. And B is any coefficient determined according to the running state of the power grid.
In step S4, the active-reactive power output process switches the control strategy of energy storage and generates active-reactive power commands of energy storage in each control strategy according to the judgment result of the state of the energy storage system and the upper and lower limits of the energy storage output:
1) when the grid state is in zone 1:
① if the energy storage system is in state 1, the energy storage system does not act;
②, if the energy storage system is in states 2 and 3, the energy storage system can be charged and discharged with active power preferentially, the control strategy adapts to scenario 3 under the working condition, and the active regulation range of the energy storage output is set as a middle gear;
2) when the grid state is in zone 2:
① if the energy storage system is in state 1, the energy storage system can be charged with reactive power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 2 under the working condition, and the active regulation range of the energy storage output is set to be a second-largest gear;
3) when the grid state is in zone 3:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 1 under the working condition, and the active regulation range of the energy storage output is set as the maximum limit gear;
4) when the grid state is in zone 4:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy under the working condition is adaptive to the situation 4, and the active regulation range of the energy storage output is set to be a second-smallest gear;
5) when the grid state is in zone 5:
① if the energy storage system is in state 1 or 2, the energy storage system can be charged with active power preferentially to restore the state of charge to close to state 3;
② if the energy storage system is in state 3, the energy storage system does not need to be active;
6) when the grid state is in zone 6:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy under the working condition is adaptive to the situation 4, and the active regulation range of the energy storage output is set to be a second-smallest gear;
7) when the grid state is in region 7:
① if the energy storage system is in state 1, the energy storage system can be charged with reactive power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, charging and discharging of reactive power can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 5 under the working condition, and the active power adjusting range of the energy storage output is set to be the minimum limit gear;
8) when the grid state is in zone 8:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially, so that the state of charge is restored to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 2 under the working condition, and the active regulation range of the energy storage output is set to be a second-largest gear;
9) when the grid state is in zone 9:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
② if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 3 under the working condition, and the active regulation range of the energy storage output is set to be a middle gear.
The embodiment also provides a battery energy storage system, which adopts the active-reactive cooperative control method of the energy storage power station, and utilizes the battery energy storage system to perform grid-connected charging and discharging through an energy storage pcs (power converter system) inverter, so as to automatically output power or absorb power grid energy, thereby realizing the active-reactive power output regulation function of accessing the energy storage into the transformer substation, and achieving the purposes of improving the quality of electric energy and improving the stability of the power grid.
The battery energy storage system is controlled by the PCS inverter and is merged into a power grid through the circuit breaker, the power instruction and the charging/discharging instruction of the battery energy storage system are controlled, and the charging/discharging of the battery energy storage system is controlled to complete the adjusting process.
The invention provides an active-reactive cooperative control method for an energy storage power station. The method comprises the steps of dividing and judging the state of the power grid by using the real-time state of the power grid (including the output power of the energy storage power station and the voltage value of the power grid) and combining a nine-area diagram, and performing coordinated control on the active-reactive power output of the energy storage power station based on the dividing and judging result. The method and the device realize that the active-reactive charging and discharging capacity of the energy storage power station is fully utilized under the existing equipment condition, and the problem of electric energy quality caused by the shortage of active power and reactive power of a power grid is solved. On the basis of improving and adjusting the active-reactive power balance of the power grid by utilizing the stored energy, the utilization rate of equipment is improved. The problem of safety and stability of the power grid caused by the deficiency of the traditional active-reactive standby or the waste caused by the idle of equipment is avoided.
The above description is only an exemplary embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art may occur to persons skilled in the art without departing from the spirit and scope of the present invention.
Claims (6)
1. An active-reactive cooperative control method for an energy storage power station is characterized by comprising the following steps:
s1, acquiring load power P of a battery energy storage system accessed to a transformer substation, access bus voltage U and state of charge SOC of the battery energy storage system from a power gridbatteryThe data sampling period is T;
s2, establishing a nine-area diagram of the voltage U and the load power P according to the voltage U and the load power P obtained in the step S1, and judging the state and the area of the energy storage power station;
s3, judging the power grid state according to the step S2Adjusting and switching an active-reactive power output coordination control strategy of the energy storage system to realize an energy storage output active power output value PbatteryAnd reactive power output value QbatteryDetermination of (1);
and S4, according to the control strategy selected in the step S3, issuing an instruction to the battery energy storage system to complete the active-reactive power output process.
2. The active-reactive cooperative control method for the energy storage power station as claimed in claim 1, wherein in step S2, the state and area of the energy storage power station are determined;
1) when U is more than or equal to 0 and less than UL0，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 1: the output power and the voltage of the energy storage system in the region are low;
2) when U is turnedL0≤U＜UH0，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 2: the voltage of the energy storage system in the area is in an optimal state, and the output power of the power station is low;
3) when U is turnedH0≤U，0≤P＜PL0And then, judging that the working condition of the power grid is in a region 3: the voltage of the energy storage system in the area is in a higher state, and the output power of the power station is lower;
4) when U is turnedH0≤U，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 4: the voltage of the energy storage system in the area is in a high state, and the output power of the power station is in an optimal state;
5) when U is turnedH0≤U，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in a region 5: the voltage of the energy storage system in the area is in a high state, and the output power of the power station is also in a high state, namely, the power station is close to a full power state;
6) when U is turnedL0≤U＜UH0，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in an area 6: the voltage of the energy storage system in the region is in a proper state, and the output power of the power station is in a higher state, namely, the power station is close to a full power state;
7) when U is more than or equal to 0 and less than UL0，PH0When P is less than or equal to P, the working condition of the power grid is judged to be in a region 7: the voltage of the energy storage system in the region is in a low state, and the output power of the power station is also in a high state, namely, the power station is close to a full power state;
8) when U is more than or equal to 0 and less than UL0，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 8: the voltage of the energy storage system in the region is in a low state, and the output power of the power station is in a proper state;
9) when U is turnedL0≤U＜UH0，PL0≤P＜PH0And then, judging that the working condition of the power grid is in a region 9: the voltage of the energy storage system in this area is in a more favorable state, and the output power of the plant is also in a more favorable state, in which the regulation margin and the regulation state of the energy storage plant are also optimal.
3. The active-reactive cooperative control method for an energy storage power station as claimed in claim 1, wherein in step S3, the active power value P of the energy storage output isbatteryAnd reactive power output value QbatteryThe determination specifically comprises the following steps:
according to the self state of charge SOC of the battery energy storage systembatteryAnd judging the state of energy storage:
setting the upper and lower output limits of active power and reactive power in the control strategy, wherein the upper limit of the active power is PmaxThe lower limit of active power is Pmin(ii) a Upper limit of reactive power of QmaxThe lower limit of the reactive power is QminAnd self-recovery is carried out on the self-state of the energy storage system, and the PCS inverter is utilized to control the charge and discharge of the energy storage system so as to realize the best performance maintenance of the equipment state of the energy storage system:
1)0≤SOCbattery＜SOCminthe energy storage system is in a state 1, and the energy storage system is insufficient in electricity quantity in the state and needs to be charged to supplement electric energy;
2)SOCmin≤SOCbattery＜SOCmaxthe energy storage system is in a state 2, and the state of the charge capacity of the energy storage system is good and the energy storage system can be charged and discharged;
3)SOCmax≤SOCbatterythe energy storage system is in a state 3, and the energy storage system is rich in electric quantity and suitable for discharging;
the charging and discharging power limit value of the energy storage system comprises the following situations and should meet the following conditions:
Pbattery∈[Pmin，Pmax]
Qbattery∈[Qmin，Qmax]
Sbattery∈[Smin，Smax]
Sbattery 2＝Pbattery 2+Qbattery 2and the active and reactive power output of the stored energy always meets the following requirements:
wherein the upper limit of active power is PmaxThe lower limit of active power is Pmin(ii) a Upper limit of reactive power of QmaxThe lower limit of the reactive power is Qmin；SbatteryApparent Power (KVA) with an upper limit of SmaxApparent power lower limit of Smin；
Case 1: maximum limit gear: pbattery＝Smax，Qbattery＝0；
Case 2: second-maximum gear limiting: pbattery＝A*Pmax，Qbattery＝B*Qmax；
Case 3: intermediate gear: pbattery＝Pmax，Qbattery＝Qmax；
Case 4: and (4) secondary small gear limiting: pbattery＝B*Pmax，Qbattery＝A*Qmax；
Case 5: minimum gear limiting: pbattery＝0，Qbattery＝Smax；
Wherein: a. the>1，B<1，Smax 2＝A2*Pmax 2+B2*Qmax 2(ii) a A. And B is any coefficient determined according to the running state of the power grid.
4. The active-reactive cooperative control method for the energy storage power station as claimed in claim 2 or 3, wherein in step S4, the active-reactive output process switches the control strategy of energy storage and generates the active-reactive power command of energy storage in each control strategy according to the judgment result of the energy storage system status and the upper and lower limits of the energy storage output:
1) when the grid state is in zone 1:
① if the energy storage system is in state 1, the energy storage system does not act;
②, if the energy storage system is in states 2 and 3, the energy storage system can be charged and discharged with active power preferentially, the control strategy adapts to scenario 3 under the working condition, and the active regulation range of the energy storage output is set as a middle gear;
2) when the grid state is in zone 2:
① if the energy storage system is in state 1, the energy storage system can be charged with reactive power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 2 under the working condition, and the active regulation range of the energy storage output is set to be a second-largest gear;
3) when the grid state is in zone 3:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 1 under the working condition, and the active regulation range of the energy storage output is set as the maximum limit gear;
4) when the grid state is in zone 4:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy under the working condition is adaptive to the situation 4, and the active regulation range of the energy storage output is set to be a second-smallest gear;
5) when the grid state is in zone 5:
① if the energy storage system is in state 1 or 2, the energy storage system can be charged with active power preferentially to restore the state of charge to close to state 3;
② if the energy storage system is in state 3, the energy storage system does not need to be active;
6) when the grid state is in zone 6:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy under the working condition is adaptive to the situation 4, and the active regulation range of the energy storage output is set to be a second-smallest gear;
7) when the grid state is in region 7:
① if the energy storage system is in state 1, the energy storage system can be charged with reactive power preferentially to recover the state of charge to state 2;
②, if the energy storage system is in states 2 and 3, charging and discharging of reactive power can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 5 under the working condition, and the active power adjusting range of the energy storage output is set to be the minimum limit gear;
8) when the grid state is in zone 8:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially, so that the state of charge is restored to state 2;
②, if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 2 under the working condition, and the active regulation range of the energy storage output is set to be a second-largest gear;
9) when the grid state is in zone 9:
① if the energy storage system is in state 1, the energy storage system can be charged with active power preferentially to recover the state of charge to state 2;
② if the energy storage system is in states 2 and 3, active power charging and discharging can be preferentially carried out on the energy storage system, the control strategy adapts to the situation 3 under the working condition, and the active regulation range of the energy storage output is set to be a middle gear.
5. A battery energy storage system is characterized in that the battery energy storage system adopts the active-reactive cooperative control method of the energy storage power station as claimed in any one of claims 1 to 4, and utilizes the battery energy storage system to realize the active-reactive output regulation function of the energy storage access transformer substation through grid-connected charging and discharging of an energy storage PCS inverter and autonomous output or power absorption of power grid energy, thereby achieving the purposes of improving the quality of electric energy and improving the stability of the power grid.
6. The battery energy storage system of claim 5, wherein the battery energy storage system is incorporated into the grid by the PCS inverter control via a circuit breaker, controls power commands and charge/discharge commands of the battery energy storage system, and controls charging/discharging of the battery energy storage system to accomplish the mediation process.
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